Fire-box construction



Jan. 8 1924.

WITNESS:

Filed Sept. 2, 1919 A. H. WILLETT FIRE BOX CONSTRUCTION 3 Sheets-Sheet /NVENTOR Pia A TTORNEYJ Jan. 8 1924.

A H. WILLETT FIRE BOX CONSTRUCTION Filed Sept. 2, 1919 3 Sheets-Sheet 3 INVENTOR WK xaw, A TTORNE Y6 Jan. 8, 1924. 1,480,134

, A. H. W ILLETT FIRE BOX CONSTRUCTI ON F iled Sept. 2, 1919 s Sheets-Sheet 5 WITNESS.-

INVENTOR A TTORNEYS Patented Jan. 8, 1924.

UNITEDSTATES PATENT OFFICE.

ALFRED H. WILIJETT, OF WEST NEW YORK, NEW JERSEY, ASSIGNOR TO AMERICAN ARCH COMPANY, A CORPORATION OF DELAWARE.

FIRE-BOX CONSTRUCTION.

Application filed September T all whom it may concern:

Be itknown that I, ALFRED H. WILLETT,

a citizen of the United States, residing at West New York, in the county of Hudson 6 and State of New Jersey, have invented certain new and useful Improvements in Fire- Box Constructions, of which the following is a specification.

The primary object of this invention is 10 the provision of a construction of water-tube supported arch for fire boxes which is adapted to use in a boiler or fire box which has a very shallow throat or front water leg such, for example, as the well known 1 .VVooten type of fire box in some of which there is hardly any water leg or throat }formation between the boiler and the fire By my invention I provide a form of arch 2 construction which may be used in these short throat boilers by combining with the forward end of the water tube a novel arrangement of drum or header construction connecting with theside water legs of the boiler into which header the arch tube ends are secured and providing means for the location of suitable wash out plugs directly opposite the arch tubes.

The above as well as such other objects as may hereinafter appear, I obtain by means of a construction which I have illustrated in preferred form in the accompanying drawings, wherein:

Figure 1 is a longitudinal vertical sec-' tional view through a fire box having my improvements applied thereto; Figure 2 is a transverse sectional view through said fire box taken on the line 22 of Figure 1; Figure 3 is an enlarged sectional view of the arrangement of washout plug which I use in the header; Figure 4: is a horizontal sectional View showing a modified pair of headers with my improvements in association therewith; Figure 5 is a sectional view taken on the line 5 5 of Figure 4; Figure 6 is an enlarged sectional view showing a modified form of wash out plug, and Figure 7 is an enlarged sectional view showing the water tube extended through the header with side outlets or openings in the tube forming connection between the tube and header.

Referring now more particularly to Fig ures 1 and 2 it will be seen that I have therein shown a locomotive fire box having the crown sheet 1, fine sheet 2 in which are 2, 1919. Serial No. 321,273.

secured the flues 3, and below the latter a very short or shallow water leg 4 having a shallow or short inner throat sheet 5.

A short distance to the rear of the throat sheet 5 I provide a pair of transversely disposed headers 6, each of these being connected at one of its ends with an adjacent side water leg 7 through the side sheet 8.

Connected with the headers 6 I provide the water tubes 9, the rear ends of which are secured in the rear sheet 10 above the door 11.

Opposite the end of each of the water tubes 9 I arrange a tubular extension 12 closed by a plug 13 forminga means through which the end of the tube may be reached whemsetting it in place or during operation for cleaning purposes, the extension 12 being preferably secured in place by welding as indicated at 14 and passing through an aperture 15 in the casting 16 that forms a channel or support for the headers 6, as well as the grate.'

The arch" 17 placed upon" the tubes is preferably arranged with its forward edge resting against the headers as shown in Figure 1, but I may use any form or disposition of the arch brick which may be required by the conditions of service.

By locating the headers a little to the rear of the water leg 4:, I provide a combustion chamber 18 above the arch and thus facilitate the combustion in the fire box.

If desired the two headers may be arranged as shown in Figures 4 and 5 with their circulation apertures opening forwardly into the space 19, the wash out plugs being located in a plane below as indicated at 20 in Figure 5. In this arrangement an additional plug is used as indicated at 21.

As indicated in Figure 6 the tubular ex- 1 tension 12 provided with. the plug 13 is formed by rolling or expanding the end as at 22 inside of the header 6, while as indicated in Figure 7, the tube 9 is extended clear through the header 6 and expanded as indicated at 23 and provided with lateral openings 24 forming a connection with the interior of the header and providing the extension 12 as an integral portion of the tube, there being a welded joint as at 25 to secure the device against leakage from the headers.

I claim 1. In a shallow throated loc0., QtiVe the box, the combination of a circulation header located to the rear of the throat,a fire grate extending rearwardly from the header, an arch supporting circulation tube communicating with the header and extending rearwardly from said header above said grate, and a plugged clean out opening in the header opposite the end of said tube accessible from the exterior of the fire box between the forward end of the grate\ and the throat.

2. In a shallow throated locomotive fire box, having water spaces a header located to the rear of the throat and communicating with a water space, a fire grate extending rearwardly from the header, an arch supporting circulation tube communicating with the header and extending rearwardly from said header above the grate to connect'the header with another Water space, and a plugged clean-out opening in the header opposite the end of said tubeaccessible from leg, a fire grate extending rearwardly from the header, an arch supporting circulation tube communicating with the header and extending rearwardly from said header above the grate to connect the header with. another Water space, and a plugged cleanout openinginthe header opposite the end of said tube accessible from the exterior of the fire box between the forward end of the grate and the throat.

In testimony whereof, I have hereunto signed my name.

ALFRED H. WILLETT. 

